HACKENSACK — A registered sex offender from Newark is back behind bars today after authorities discovered he had been using social media websites.

Thaddeus Gill, 46, formerly of Lodi, is banned from the websites as a condition of his release, which requires him to be supervised for life, Bergen County Prosecutor John L. Molinelli said.

Judicial records indicate that he has a 2002 conviction for having sexual contact with a 10-year-old girl out of Passaic County.

Gill was taken into custody on Monday, and is currently being held at the Bergen County Jail on $25,000 bond.

Molinelli said he has been known to use the screen names "TGil", "Tgil3036" and "Thad Gi''l" on the internet. Anyone who has been contacted by him is asked to call the Bergen County Prosecutor's Office Computer Crimes Unit at (201) 646-2300.